import axios from "axios";
import {
  ElNotification,
  ElMessageBox,
  ElMessage,
  ElLoading,
} from "element-plus";
import { getToken } from "@/utils/auth";
import errorCode from "@/utils/errorCode";
import { tansParams, blobValidate } from "@/utils/ruoyi";
import cache from "@/plugins/cache";
import { saveAs } from "file-saver";
import useUserStore from "@/store/modules/user";

let downloadLoadingInstance;
// 是否显示重新登录
export let isRelogin = { show: false };

axios.defaults.headers["Content-Type"] = "application/json;charset=utf-8";
// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: import.meta.env.VITE_APP_BASE_API,
  // 超时
  timeout: 10000,
});

// get重复请求时取消上一次未完成请求
let pendingRequest = new Map();
const generateKey = (config) => {
  if (config?.headers?.pendingKey) return config?.headers?.pendingKey;
  let { method, url, params, data } = config;
  return [method, url].join("&");
};
const addPendingRequest = (config) => {
  // 1、调用 generateKey 方法生成 key
  const requestKey = generateKey(config);
  /**
   * 2、为本次请求添加 cancelToken（取消令牌）,
   * 同时将key 和 取消函数构成的对象添加到 map 中
   */
  config.cancelToken =
    config.cancelToken ||
    new axios.CancelToken((cancel) => {
      if (!pendingRequest.has(requestKey)) {
        pendingRequest.set(requestKey, cancel);
      }
    });
};
/**
 * @description 取消重复请求 **/
const removePendingRequest = (config) => {
  const pendingKey = generateKey(config);
  const cancelToken = pendingRequest.get(pendingKey);
  if (cancelToken) {
    cancelToken(" 取消重复请求:" + pendingKey);
    pendingRequest.delete(pendingKey);
  }
};

// 所有POST经过拦截器的请求url存储空间
let requestList = new Set();

// request拦截器
service.interceptors.request.use(
  (config) => {
    const method = config.method.toLowerCase();
    config.headers.norepeat = true;
    // 是否需要设置 token
    const isToken = (config.headers || {}).isToken === false;
    // 是否需要防止数据重复提交
    const isRepeatSubmit = (config.headers || {}).repeatSubmit === false;
    if (getToken() && !isToken) {
      config.headers["Authorization"] = "Bearer " + getToken(); // 让每个请求携带自定义token 请根据实际情况自行修改
    }
    // get重复请求时取消上一次未完成请求
    if (
      config &&
      config.headers.pendingKey &&
      config.method.toLowerCase() === "get"
    ) {
      if (config.headers.cancelCurrent) {
        //取消当次，等待上次结果
        if (pendingRequest.has(config.headers.pendingKey))
          return Promise.reject(new axios.Cancel("数据正在处理!"));
        addPendingRequest(config);
      } else {
        //取消上次，等待当次
        removePendingRequest(config);
        addPendingRequest(config);
      }
    }
    // get请求映射params参数
    if (method === "get" && config.params) {
      let url = config.url + "?";
      for (const propName of Object.keys(config.params)) {
        const value = config.params[propName];
        var part = encodeURIComponent(propName) + "=";
        if (value !== null && typeof value !== "undefined") {
          if (typeof value === "object") {
            for (const key of Object.keys(value)) {
              if (value[key] !== null && typeof value[key] !== "undefined") {
                let params = propName + "[" + key + "]";
                let subPart = encodeURIComponent(params) + "=";
                url += subPart + encodeURIComponent(value[key]) + "&";
              }
            }
          } else {
            url += part + encodeURIComponent(value) + "&";
          }
        }
      }
      url = url.slice(0, -1);
      config.params = {};
      config.url = url;
    }
    if (!isRepeatSubmit && (method === "post" || method === "put")) {
      // 上一个请求未响应前视为重复提交
      const reqdata =
        typeof config.data === "object"
          ? JSON.stringify(config.data)
          : config.data;
      const requestFlag =
        JSON.stringify(config.url) +
        JSON.stringify(reqdata) +
        "&" +
        config.method;
      if (requestList.has(requestFlag)) {
        return Promise.reject(new Error("数据正在处理，请勿重复提交!"));
      } else {
        requestList.add(requestFlag);
      }
      // 小于1s视为重复提交
      const requestObj = {
        url: config.url,
        data:
          typeof config.data === "object"
            ? JSON.stringify(config.data)
            : config.data,
        time: new Date().getTime(),
      };
      const sessionObj = cache.session.getJSON("sessionObj");
      if (
        sessionObj === undefined ||
        sessionObj === null ||
        sessionObj === ""
      ) {
        cache.session.setJSON("sessionObj", requestObj);
      } else {
        const s_url = sessionObj.url; // 请求地址
        const s_data = sessionObj.data; // 请求数据
        const s_time = sessionObj.time; // 请求时间
        const interval = 1000; // 间隔时间(ms)，小于此时间视为重复提交
        if (
          s_data === requestObj.data &&
          requestObj.time - s_time < interval &&
          s_url === requestObj.url
        ) {
          const message = "数据正在处理，请勿重复提交";
          console.warn(`[${s_url}]: ` + message);
          return Promise.reject(new Error(message));
        } else {
          cache.session.setJSON("sessionObj", requestObj);
        }
      }
    }
    return config;
  },
  (error) => {
    console.log(error);
    Promise.reject(error);
  }
);

// 响应拦截器
service.interceptors.response.use(
  (res) => {
    const config = res.config;
    // 请求完成，移除请求列表中对应请求
    if (
      config &&
      config.headers.pendingKey &&
      config.method.toLowerCase() === "get"
    ) {
      removePendingRequest(config);
    }
    const isRepeatSubmit = (config.headers || {}).repeatSubmit === false;
    const ErrorSilence = (config.headers || {}).ErrorSilence === true;
    console.log("ErrorSilence", ErrorSilence);
    if (
      !isRepeatSubmit &&
      (config.method === "post" || config.method === "put")
    ) {
      const reqdata =
        typeof config.data === "object"
          ? JSON.stringify(config.data)
          : config.data;
      const requestFlag =
        JSON.stringify(config.url) +
        JSON.stringify(reqdata) +
        "&" +
        config.method;
      requestList.delete(requestFlag);
    }
    // 未设置状态码则默认成功状态
    const code = res.data.code || 200;
    // 获取错误信息
    const msg = errorCode[code] || res.data.msg || errorCode["default"];
    // 二进制数据则直接返回
    if (
      res.request.responseType === "blob" ||
      res.request.responseType === "arraybuffer"
    ) {
      return res.data;
    }
    if (ErrorSilence && code !== 200) return Promise.reject("ErrorSilence");
    if (code === 401) {
      if (!isRelogin.show) {
        isRelogin.show = true;
        ElMessageBox.confirm(
          "登录状态已过期，您可以继续留在该页面，或者重新登录",
          "系统提示",
          {
            confirmButtonText: "重新登录",
            cancelButtonText: "取消",
            type: "warning",
          }
        )
          .then(() => {
            isRelogin.show = false;
            useUserStore()
              .logOut()
              .then(() => {
                location.href = "/index";
              });
          })
          .catch(() => {
            isRelogin.show = false;
          });
      }
      return Promise.reject("无效的会话，或者会话已过期，请重新登录。");
    }
    if (code === 500) {
      ElMessage({
        message: msg,
        type: "error",
      });
      return Promise.reject(new Error(msg));
    } else if (code === 502) {
      ElMessage({
        message:
          "为了让您更好的使用系统，我们正在对服务器进行升级，升级期间暂时无法访问。给您带来的不便，敬请谅解！",
        type: "error",
      });
      return Promise.reject(new Error(msg));
    } else if (code !== 200) {
      ElNotification.error({
        title: msg,
      });
      return Promise.reject("error");
    } else {
      return res.data;
    }
  },
  (error) => {
    console.log("err", error, error instanceof axios.Cancel);
    if (error instanceof axios.Cancel) return Promise.reject(error);
    // get重复请求时取消上一次未完成请求
    const config = error.config;
    if (
      error.config &&
      config.headers.pendingKey &&
      config.method.toLowerCase() === "get"
    ) {
      removePendingRequest(config);
    }
    const ErrorSilence = (config.headers || {}).ErrorSilence === true;
    console.log("ErrorSilence2", ErrorSilence);
    let { message } = error;
    if (message == "ErrorSilence" || ErrorSilence) {
      return null;
    }
    const msgCode = message.substr(message.length - 3);
    if (message == "Network Error") {
      message = "服务器连接异常，请检查网络连接！";
    } else if (message.includes("timeout")) {
      message = "系统响应超时，请检查网络连接或联系管理员处理！";
    } else if (message.includes("Request failed with status code 502")) {
      message =
        "为了让您更好的使用系统，我们正在对服务器进行升级，升级期间暂时无法访问。给您带来的不便，敬请谅解！";
    } else if (msgCode == "404") {
      message =
        "功能异常，可能是页面版本不一致，请刷新页面再试。如仍有异常请联系管理员处理！";
    } else if (message.includes("Request failed with status code")) {
      message = `抱歉！功能异常,请联系管理员处理。(${msgCode})`;
    }
    ElMessage({
      message: message,
      type: "error",
      duration: 5 * 1000,
    });
    return Promise.reject(error);
  }
);

// 通用下载方法
export function download(url, params, filename, config) {
  downloadLoadingInstance = ElLoading.service({
    text: "正在下载数据，请稍候",
    background: "rgba(0, 0, 0, 0.7)",
  });
  return service
    .post(url, params, {
      transformRequest: [
        (params) => {
          return tansParams(params);
        },
      ],
      headers: { "Content-Type": "application/x-www-form-urlencoded" },
      responseType: "blob",
      ...config,
    })
    .then(async (data) => {
      const isBlob = blobValidate(data);
      if (isBlob) {
        const blob = new Blob([data]);
        saveAs(blob, filename);
      } else {
        const resText = await data.text();
        const rspObj = JSON.parse(resText);
        const errMsg =
          errorCode[rspObj.code] || rspObj.msg || errorCode["default"];
        ElMessage.error(errMsg);
      }
      downloadLoadingInstance.close();
    })
    .catch((r) => {
      console.error(r);
      ElMessage.error("下载文件出现错误，请联系管理员！");
      downloadLoadingInstance.close();
    });
}

export default service;
